So I'm on a system that prevents internet access to the internet by Unity itself and there is nothing that I can do about it. Unity 4 used to allow you to go through the manual process. Unity 5 insists that you Sign into your account first. If you can't (due to said Firewall), you might as well unistall Unity since you plain up can't use it. There is no way to complete the process unless you can sign into your unity account from what I can tell. All you get it "Service not available, please try again later" not that "later" will be any better since the firewall is the issue. Has anyone found a way around this? If not, hey Unity development team, you need to fix this. How about add a manual activation button? As much as I would love to have full access here, I have a better chance of winning the lottery than making that happen.